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The service manual does not state that they need to be replaced so they can be re-used. Personally I always buy new bolts for jobs like this as it's cheap insurance but many on this forum re-use them.
Try running a search on this in the tech section...
Being a mechanic and i reused most 9/10 times ofcourse on different cars/trucks, however i would buy new ones for us, knowing how much work involved to get there.
You can buy ARP i had to grind some but i heard people have used Auto flex plate ARP in our manual Flywheel, never used though.
GM stock should be fine, i usually torque 5-10 lbs more what they say.